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Old 28th June 2020, 10:52   #2301  |  Link
mzso
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Quote:
Originally Posted by nevcairiel View Post
My 7900X (OC) can also play that video in 8K without drops, at 40% usage at most - straight in Chrome 83. Make sure its not your GPU that struggles downscaling the 8K video.

With Ryzen making 8 cores available to "mere mortals" for relatively low pricing, I don't think you need any particular "beast" right now, nevermind the next decade.
Well, I have an RX 580 with the R5 1600 and it's the CPU is what I see saturated. Both AV1 and VP9. And madVR shows decoder queue 1-4/4 upload/render 1-2/4, present 0-1/4

It doesn't seem like the GPU gets a chance to be too slow.

By the way I tried these videos' 8k AV1/VP9 streams:
https://www.youtube.com/watch?v=zCLOJ9j1k2Y
https://www.youtube.com/watch?v=1La4QzGeaaQ

Last edited by mzso; 28th June 2020 at 16:29.
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Old 28th June 2020, 11:41   #2302  |  Link
huhn
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zen 1 and 1+ have a bad AVX/AVX2 implementation they need 2 cycles to do such a operation unlike intel and zen 2 which can do that in 1 giving them 2x the ipc in decoding of modern codecs.

these are 8k 60 this is to much for my CPU too it's not even close.
edit:i take it back i get it barely working with EVR-CP.

Last edited by huhn; 28th June 2020 at 11:50.
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Old 1st July 2020, 18:17   #2303  |  Link
marcomsousa
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Chrome 85 will have AVIF support by default (Beta Jul 23, release Aug 25)
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Old 9th July 2020, 21:57   #2304  |  Link
Yups
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As for Intels Gen12 their Open source driver did enable AV1 decoding: https://github.com/intel/media-drive...3c0e9e945b8062

In one file it says MaxTile is 4096x2304, this coincides with the leak about Tigerlake 4k60 video.
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Old 10th July 2020, 00:10   #2305  |  Link
huhn
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great there can't be enough hardware decoder for promising codecs.
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Old 10th July 2020, 09:49   #2306  |  Link
GTPVHD
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Quote:
FtrIntelAV1VLDDecoding8bit420
FtrIntelAV1VLDDecoding10bit420
Tiger Lake's Gen12 GPU only supports AV1 4K 10-bit 4:2:0 fixed function(VLD) hardware decoding, not even 8K 12-bit 4:4:4 like it does with VP9, kinda disappointing.

Last edited by GTPVHD; 10th July 2020 at 10:04.
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Old 10th July 2020, 15:52   #2307  |  Link
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Not even 8K 12 bit sounds strange, there is no real need for 12 bit. Actually it's similar to Gen9.5 which supports 8/10 Bit 4:2:0 VP9/HEVC, even though it did support 8K afaik. Apparently it's not a trivial VP9 copy and paste, you should be happy that at least one major GPU IHV is going to support AV1 this year even if it's not the super highest possible variant.
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Old 10th July 2020, 17:22   #2308  |  Link
benwaggoner
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Not even 8K 12 bit sounds strange, there is no real need for 12 bit. Actually it's similar to Gen9.5 which supports 8/10 Bit 4:2:0 VP9/HEVC, even though it did support 8K afaik. Apparently it's not a trivial VP9 copy and paste, you should be happy that at least one major GPU IHV is going to support AV1 this year even if it's not the super highest possible variant.
AV1 is a pretty complex bitstream to decode.

For moving image content for humans to watch at a distance where they can comfortably see the action in all four corners of the screen, 8K is pretty much indistinguishable from 4K. No one is actually mastering premium content in 8K (some 8K cameras get used, but all post is done in 4K, and often 2K for VFX).

12-bit has some theoretical value, but it's not like there are native 12-bit panels to watch it on. Given all the dithering that goes on, 10-bit is sufficient in most cases. 12-bit's value would mainly to be to not have to worry about dithering in post and encoding with HDR, like how 10-bit pretty much eliminates those concerns with SDR.

All that said, has anyone seen any compelling research on AV1 encoding in HDR or 4K? Pretty much everything I've read at outside of marketing and demos has been SDR and 1080p or lower.
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Old Yesterday, 14:54   #2309  |  Link
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